scholarly journals STUDY ON PERMEABILITY AND ELECTRICAL RESISTIVITY OF RED CLAY CONTAMINATED BY CU2+

2021 ◽  
Vol 30 (1) ◽  
Author(s):  
Rulong Ban ◽  
Xuejun Chen ◽  
Yu Song ◽  
Pengyan Bi ◽  
Xin Yang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Electrical Resistivity ◽  
Hydraulic Conductivity ◽  
Water Content ◽  
Contaminated Soil ◽  
Initial Water Content ◽  
Red Clay ◽  
Initial Water ◽  
Electrode Method ◽  
The Relationship

In order to study the permeability characteristics of heavy metal ions contaminated red clay and explore the rapid detection of permeability of heavy metal contaminated red clay. Through variable-head permeability test and electrical resistivity test (different voltages and methods), the effects of Cu2+ concentration and initial water content on hydraulic conductivity characteristic and resistivity of contaminated red clay was systematically investigated. The relationship between permeability characteristic and electrical resistivity was further explored by taking Cu2+ concentration and moisture content as the intermediate variable. The obtained results indicate that the different voltage has no obvious effect on the resistivity of the samples. The four-phase electrode method is more accurate than the two-phase electrode method. With increasing Cu2+ concentrations the hydraulic conductivity of specimens increases, however the permeability coefficient of contaminated soil decreases with increasing initial water content. In the resistivity test, with increasing of Cu2+ concentrations and water content, the resistivity of samples presented a downward trend, which is decreased sharply at first and then tended to be gentle. The relationship between hydraulic conductivity and resistivity of contaminated soil showed a good fitting curve no matter in different Cu2+ concentration or in different water content, but the fitting curves of them presented opposite trend.

On the validity of the theory of flow in saturated swelling materials

Soil Research ◽  
1976 ◽  
Vol 14 (3) ◽  
pp. 389 ◽  
Author(s):  
DE Smiles
Keyword(s):  
Hydraulic Conductivity ◽  
Water Content ◽  
Transient Flow ◽  
Initial Water Content ◽  
Approximate Theory ◽  
Initial Water ◽  
One Dimensional ◽  
Physically Based ◽  
Conductivity Water ◽  
The Relationship

Recently there has been concern that the reorientation of particles during transient flow of water in a saturated swelling material might result in the hydraulic conductivity and capillary potential not being well-defined functions of the water content. If this were the case, the conventional theory of one-dimensional liquid flow in these materials would be invalid. This paper shows that the hydraulic-conductivity/water-content relationship calculated using physically based approximate theory applied to outflow data obtained from red mud, is single-valued and independent of initial water content. Furthermore, the relationship permits recalculation, using a correct iterative procedure, of the data from which it was derived. It is concluded that the data provide no evidence to reject the theory, and that particle reorientation, if it occurs, is parametrized by the water content.

scholarly journals Influence of bentonite type and producing method on hydraulic conductivity of sand–bentonite mixture

2020 ◽  
Vol 205 ◽  
pp. 10005
Author(s):  
Tomonori Sakita ◽  
Hideo Komine ◽  
Atsuo Yamada ◽  
Hailong Wang ◽  
Shigeru Goto
Keyword(s):  
Hydraulic Conductivity ◽  
Water Content ◽  
Water Mass ◽  
Water Volume ◽  
Dry Density ◽  
Initial Water Content ◽  
Specimen Preparation ◽  
Initial Water ◽  
Compaction Energy ◽  
Low Level Radioactive Waste

Sand-bentonite mixtures with bentonite content of 10-30% had been planned to handle low-level radioactive waste in Japan, because of its low permeability. Hydraulic conductivity of sand–bentonite mixture depends on the bentonite type, bentonite content, initial water content, and other factors. Given this background, falling head permeability tests were conducted on sand–bentonite mixture by varying the compaction energy for specimen preparation, initial water content (10–20%), and bentonite content (15– 30%). For these tests, the hydraulic gradient of 25-500 was set. Consequently, the hydraulic conductivities were 10-8 – 10-13 m/s for all tested conditions. Correlation between the hydraulic conductivity and the effective montmorillonite dry density (montmorillonite mass divided by the sum of montmorillonite, air, water volume), which is often used to correlate the hydraulic conductivity of bentonite, was found. Correlation was also found between the hydraulic conductivity and a new index designated as the effective montmorillonite wet density (sum of montmorillonite and water mass / sum of montmorillonite, air, water volume). Effective montmorillonite wet density reveals differences in the specimen structural distribution through consideration of the initial water content.

scholarly journals The relationship between imbibitional damage and initial water content of soybeans.

1988 ◽  
Vol 52 (11) ◽  
pp. 2771-2775 ◽  
Author(s):  
Nobuaki ISHIDA ◽  
Hiromi KANO ◽  
Toshio KOBAYASHI ◽  
Hideo HAMAGUCHI ◽  
Takashi YOSHIDA
Keyword(s):  
Water Content ◽  
Initial Water Content ◽  
Initial Water ◽  
Imbibitional Damage ◽  
The Relationship

The Relationship between Imbibitional Damage and Initial Water Content of Soybeans

1988 ◽  
Vol 52 (11) ◽  
pp. 2771-2775
Author(s):  
Nobuaki Ishida ◽  
Hiromi Kano ◽  
Toshio Kobayashi ◽  
Hideo Hamaguchi ◽  
Takashi Yoshida
Keyword(s):  
Water Content ◽  
Initial Water Content ◽  
Initial Water ◽  
Imbibitional Damage ◽  
The Relationship

SOIL WATER CHARACTERISTIC CURVES OF COMPACTED KAOLIN FOR VARIOUS INITIAL MOISTURE CONTENT

2015 ◽  
Vol 76 (2) ◽  
Author(s):  
Muhammad Azril Hezmi ◽  
Radzuan Saari ◽  
Mohd Zakri Zahari ◽  
Rini Asnida Abdullah ◽  
Nor Zurairahetty Mohd Yunus ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Filter Paper ◽  
Unsaturated Soils ◽  
Initial Moisture Content ◽  
Great Influence ◽  
Water Retention Curve ◽  
Initial Water Content ◽  
Initial Water ◽  
The Relationship

The soil water characteristic curve (SWCC), also known as soil water retention curve (SWRC), describes the relationship between water content and soil suction in unsaturated soils. The importance of SWCC can be seen, as the relationship affects geotechnical properties such as shear strength, volume change, permeability and deformability of unsaturated soils. This paper presented a preliminary study on the effect of initial water content and the density on SWCC on unsaturated compacted kaolin. Filter paper technique was used for suction measurement on the unsaturated compacted kaolin soil. Filter paper was used to determine total suction and matric suction through contact and noncontact technique. The calibration curve was used to relate with the gravimetric water content obtained in filter paper with corresponding suction. A comparison on SWCC established through filter paper was also compared with that of the axis translation technique (pressure plate extractor). The study found that the initial water content and the density respectively, have great influence on the SWCC of compacted kaolin. However, the combined effect could be seen significantly at lower suction

scholarly journals Disintegration characteristics in granite residual soil and their relationship with the collapsing gully in South China

2020 ◽  
Vol 12 (1) ◽  
pp. 1116-1126
Author(s):  
Chengsheng Li ◽  
Lingwei Kong ◽  
Rongjun Shu ◽  
Ran An ◽  
Xianwei Zhang
Keyword(s):  
Hydraulic Conductivity ◽  
Water Content ◽  
Initial Water Content ◽  
Residual Soil ◽  
Disintegration Rate ◽  
Initial Water ◽  
Rainwater Infiltration ◽  
Maximum Decrease ◽  
Granite Residual Soil ◽  
Collapsing Gully

AbstractThe climate is a significant factor affecting the collapsing gully in weathered granite areas, and most of the surface layers of the collapsed area comprise granite residual soil. Granite residual soil has complex disintegration characteristics under different initial water content conditions. Besides, its disintegration characteristic is an essential factor for collapsing gully. Therefore, disintegration tests, triaxial shear tests, nuclear magnetic resonance tests, and hydraulic conductivity tests are conducted under torridity and rainstorm conditions in order to study the disintegration characteristics of granite residual soil. The results of disintegration test showed that the initial disintegration rate of granite residual soil increased rapidly with the decrease in water content, while the relationship between disintegration rate and water content in the later stage of disintegration is unclear. When soaked, the maximum decrease in cohesion was 44.48%, the hydraulic conductivity became six times larger, and the amplitude of the T2 curve increased by about 40%, which reduced the strength of the soil and provided better access for rainwater infiltration to deeper stratum. The results show that the microstructure of granite residual soil would be damaged and the disintegration would occur after a rainstorm at low water content. Micropores would be formed inside the sample after soaking, resulting in destroying the continuity of the material.

Influence of initial water content and strain rate on remolded yield stress in marine clay

2021 ◽  
pp. 1-8
Author(s):  
Xiaobing Li ◽  
Jianpeng Chen ◽  
Xiuqing Hu ◽  
Hongtao Fu ◽  
Jun Wang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Water Content ◽  
Yield Stress ◽  
Initial Water Content ◽  
Marine Clay ◽  
Initial Water

scholarly journals Application of the Calorimetric Methods to the Characteristics of Seeds from Olives

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 90
Author(s):  
Andrzej Bryś ◽  
Joanna Bryś ◽  
Marko Obranović ◽  
Dubravka Škevin ◽  
Szymon Głowacki ◽  
...  
Keyword(s):  
Olive Oil ◽  
Water Content ◽  
Cooling System ◽  
Waste Product ◽  
Normal Pressure ◽  
Ash Content ◽  
Initial Water Content ◽  
Scanning Calorimetry ◽  
Initial Water

The olive oil industry represents an important productive sector in the Mediterranean basin countries. Olive stone is an essential by-product generated in the olive oil extraction industries and it represents roughly 10% by weight of the olive fruit. The seeds of pickled olives are also a significant waste product. In the present study, we have investigated the possibility of the use of differential scanning calorimetry for the thermal characterization of seeds from green and black pickled olives from Croatia. The differential scanning calorimeter (DSC) with a normal pressure cell equipped with a cooling system was used to determine the thermal properties of seeds from olives. The following analyses were also performed: the determination of calorific values in a pressure bomb calorimeter, the determination of initial water content, the determination of changes of water content during drying at the temperatures of 30 °C, 50 °C and 80 °C, the determination of a percentage content of seeds mass to the mass of the whole olives, and the determination of ash content. Seeds from olives are characterized by very good parameters as a biomass. The analyzed olive seeds were characterized by low water content, low ash content, and a relatively high caloric value.

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